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    <title>Document</title>
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    <script>
        //高级api 不兼容 socket.io(一般使用它 )
        let socket = new WebSocket('ws://localhost:8000');
        socket.onopen = function(){
            socket.send('我爱你');
        }
        socket.onmessage = function(e){
            console.log(e.data)
        }
    </script>
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